GB2221071B - Improvements in electronic keyboards - Google Patents

Improvements in electronic keyboards

Info

Publication number
GB2221071B
GB2221071B GB8915297A GB8915297A GB2221071B GB 2221071 B GB2221071 B GB 2221071B GB 8915297 A GB8915297 A GB 8915297A GB 8915297 A GB8915297 A GB 8915297A GB 2221071 B GB2221071 B GB 2221071B
Authority
GB
United Kingdom
Prior art keywords
electronic keyboards
keyboards
electronic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
GB8915297A
Other versions
GB2221071A (en
GB8915297D0 (en
Inventor
David L Impett
Gary Neville
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Devlin Electronics Ltd
Original Assignee
Devlin Electronics Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB888815884A external-priority patent/GB8815884D0/en
Priority claimed from GB898910989A external-priority patent/GB8910989D0/en
Application filed by Devlin Electronics Ltd filed Critical Devlin Electronics Ltd
Publication of GB8915297D0 publication Critical patent/GB8915297D0/en
Publication of GB2221071A publication Critical patent/GB2221071A/en
Application granted granted Critical
Publication of GB2221071B publication Critical patent/GB2221071B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M11/00—Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys
    • H03M11/003—Phantom keys detection and prevention

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Input From Keyboards Or The Like (AREA)
GB8915297A 1988-07-04 1989-07-04 Improvements in electronic keyboards Expired - Fee Related GB2221071B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888815884A GB8815884D0 (en) 1988-07-04 1988-07-04 Improvements in electronic keyboards
GB898910989A GB8910989D0 (en) 1989-05-12 1989-05-12 Improvements in electronic keyboards

Publications (3)

Publication Number Publication Date
GB8915297D0 GB8915297D0 (en) 1989-08-23
GB2221071A GB2221071A (en) 1990-01-24
GB2221071B true GB2221071B (en) 1992-08-19

Family

ID=26294113

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8915297A Expired - Fee Related GB2221071B (en) 1988-07-04 1989-07-04 Improvements in electronic keyboards

Country Status (1)

Country Link
GB (1) GB2221071B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8159372B2 (en) 2007-10-16 2012-04-17 Microsoft Corporation Keyboard with plural key switch matrices to detect ghosting
WO2020252770A1 (en) * 2019-06-21 2020-12-24 深圳市柔宇科技有限公司 Control method, keyboard, and electronic equipment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0095023A2 (en) * 1982-05-20 1983-11-30 International Business Machines Corporation Contact keyboard with finger controlled N-key rollover
US4420744A (en) * 1981-02-12 1983-12-13 Oak Industries Inc. Keyboard crosspoint encoder having N-key rollover
GB2162351A (en) * 1984-07-24 1986-01-29 Alps Electric Co Ltd A keyboard input device and a method of controlling keyboard signals
EP0229695A2 (en) * 1986-01-08 1987-07-22 Brother Kogyo Kabushiki Kaisha A matrix switching apparatus for preventing pseudo input
GB2203576A (en) * 1987-04-13 1988-10-19 Apple Computer Keyboard crosspoint encoder having pseudo-n-key rollover

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4420744A (en) * 1981-02-12 1983-12-13 Oak Industries Inc. Keyboard crosspoint encoder having N-key rollover
EP0095023A2 (en) * 1982-05-20 1983-11-30 International Business Machines Corporation Contact keyboard with finger controlled N-key rollover
GB2162351A (en) * 1984-07-24 1986-01-29 Alps Electric Co Ltd A keyboard input device and a method of controlling keyboard signals
EP0229695A2 (en) * 1986-01-08 1987-07-22 Brother Kogyo Kabushiki Kaisha A matrix switching apparatus for preventing pseudo input
GB2203576A (en) * 1987-04-13 1988-10-19 Apple Computer Keyboard crosspoint encoder having pseudo-n-key rollover

Also Published As

Publication number Publication date
GB2221071A (en) 1990-01-24
GB8915297D0 (en) 1989-08-23

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20040704